$\textit{Đáp án + Giải thích các bước giải:}$
$\text{a) 5$\dfrac{2}{10}$ + 7$\dfrac{1}{10}$ = $\dfrac{52}{10}$ + $\dfrac{71}{10}$ = $\dfrac{123}{10}$}$
$\text{b) 5$\dfrac{6}{7}$ - 3$\dfrac{5}{7}$ = $\dfrac{41}{7}$ - $\dfrac{21}{7}$ = $\dfrac{15}{7}$}$
$\text{c) 8$\dfrac{3}{5}$ x 2$\dfrac{2}{7}$ = $\dfrac{43}{5}$ x $\dfrac{16}{7}$ = $\dfrac{688}{35}$}$
$\text{d) 1$\dfrac{3}{10}$ + 5$\dfrac{7}{8}$ = $\dfrac{13}{10}$ + $\dfrac{47}{8}$ = $\dfrac{52}{40}$ + $\dfrac{235}{40}$ = $\dfrac{287}{40}$}$
